CN201246598Y - Temperature-sensing wax type thermodynamic element - Google Patents

Abstract

The temperature-sensitive wax-type thermal power element includes a housing 2, and its characteristic is that: the lower end of the housing 2 is provided with a front housing 1, and the front housing 1 is connected with the housing 2; The rubber sleeve 3 is provided with a temperature-sensitive wax 7 between the housing 2 and the rubber sleeve 3; It relies on the temperature-sensitive wax to expand and contract at different temperatures, so that the ejector rod of the thermal power device is extended and shortened to open and close the valve. The shell of the wax-type thermal power device is divided into two parts: the shell and the front shell, and the two parts are connected by threads. This structure improves the thermal conductivity of the wax-type thermal power device, meets the stamping processing requirements of the thermal power device in mass production, ensures the hardness of the thermal power device directly as the sealing surface, and the ability to resist cavitation, and improves the wax-type thermal power device. performance of thermal power units and prolong their service life.

Description

Sensitive wax thermal power element

technical field

The utility model relates to the technical field of a wax-type thermodynamic element for a steam trap filled with temperature-sensing wax, in particular to a temperature-sensing wax-type thermodynamic element.

Background technique

The wax-type temperature-sensing device is used to replace the bellows device used in the cooling system of the internal combustion engine for temperature control, and the domestic development of the wax-type temperature-sensing device began in the 1970s. At present, there are mainly two kinds of copper wax-type thermal power devices and stainless steel wax-type thermal power devices in China, but they have their own shortcomings in the application process. The thermal conductivity of the copper wax-type thermal power device is about 383.8W·m ^-1 ·K ^-1 , with sensitive response and small hysteresis, but its hardness is low, the cavitation resistance is poor, and the sealing surface is easy to be damaged; the stainless steel wax type Although the thermal power device has high hardness, its thermal conductivity is relatively small, about 17W·m ^-1 ·K ^-1 , so the lag time is large, and it is not conducive to stamping because of its high hardness.

Contents of the invention

The purpose of this utility model is to provide a temperature-sensing wax type thermal power element for the defects in the prior art, which uses the temperature-sensing wax to expand and contract at different temperatures, so that the ejector rod of the thermal power element is elongated and shortened to start The valve is closed, thereby effectively overcoming a series of problems described in the background art.

The technical scheme adopted by the utility model to solve its technical problems is: the temperature-sensitive wax type thermodynamic element includes a shell 2, and its characteristic is that: the lower end of the shell 2 is provided with a front shell 1, and the front The shell 1 is connected with the shell 2; a rubber sleeve 3 is provided in the shell 2, and a temperature-sensitive wax 7 is provided between the shell 2 and the rubber sleeve 3; Pass through the plug 5 and be arranged in the rubber sleeve 3 .

Compared with the background technology, the utility model has the beneficial effect that: the temperature-sensing wax-type thermodynamic element depends on the expansion and contraction of the temperature-sensing wax at different temperatures, so that the ejector pin of the thermodynamic device is elongated and shortened. For opening and closing valves, the shell of the wax-type thermal power device is divided into two parts: the shell and the front shell. The material of the front shell is stainless steel, and its end is an inverted cone to serve as the valve core. Part of the threaded connection is used. This structure improves the thermal conductivity of the wax-type thermal power device, meets the stamping processing requirements of the thermal power device in mass production, and ensures the hardness of the thermal power device directly as the sealing surface and the ability to resist cavitation. , improving the performance of the wax-type thermal power unit and prolonging its service life.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1. Front shell; 2. Shell; 3. Rubber sleeve; 4. Ejector; 5. Plug; 6. Gasket; 7. Temperature sensitive wax.

Detailed ways

As shown in Figure 1, the temperature-sensitive wax-type thermodynamic element includes a housing 2, which is characterized in that: the lower end of the housing 2 is provided with a front housing 1, and the front housing 1 is connected to the housing 2. connection; a rubber sleeve 3 is provided in the housing 2, and a temperature-sensitive wax 7 is provided between the housing 2 and the rubber sleeve 3; Set of 3 inside.

A gasket 6 is provided between the rubber sleeve 3 and the plug 5 . The inner cavity of the rubber sleeve 3 provided with the push rod 4 is a vacuum. The end of the front housing 1 is an inverted cone acting as a spool, and the groove connecting the front housing 1 and the housing 2 is provided with an internal thread, and the internal thread in the groove of the front housing 1 is connected with the external thread on the housing 2. thread to match.

The specific installation process of the temperature-sensitive wax-type thermal power element is as follows: first, according to the calculated volume of the temperature-sensitive wax that should be filled, use a mold to make the temperature-sensitive wax mixture (in a solid state at room temperature) into an outer diameter and a shell The inner diameter of the body 2 is basically the same, and the inner diameter is basically the same as the outer diameter of the rubber sleeve 3. Then assemble the front shell 1 and the shell 2 with threads, and put the prefabricated cylindrical body temperature-sensitive wax mixture into the shell In the body 2, put the rubber sleeve 3 into the inner cavity of the cylinder wax at the same time, place the gasket 6 on the top of the rubber sleeve 3, and then use the plug 5 to press the gasket 6 and the rubber sleeve 3 from the top of the housing 2. Tighten it, then press the large end cylinder of the shell 2 with a special fixture to fix the plug 5, and finally put the ejector rod 4 into the inner cavity of the rubber sleeve 3 after vacuuming the inner cavity of the rubber sleeve 3, so far The warm wax type thermal power element has been assembled. However, when the wax-type thermal power device is installed into the steam trap, there is a problem of whether the overhang of the ejector rod 4 meets the initial stroke requirements. If the overhang is too small, a special clamp can be used to squeeze the outside of the shell 2, so that The volume of the inner cavity becomes smaller, forcing the ejector rod 4 to move outward until the initial stroke requirement is met.

The temperature-sensitive wax-type thermal power element, wherein the shell is made of red copper, and the outer surface of the small cylinder at the front end is machined with external threads; the front shell is made of stainless steel, and the inner surface of the groove is machined with internal threads , and after surface induction hardening, the shell and the front shell are connected by threads. During the working process, the temperature-sensitive wax conducts rapid heat transfer through the shell and the outside, so that the wax-type thermal power element is extended or shortened to realize the opening and closing of the valve. When the valve is opened and closed, the front shell acts as a valve core, which reduces the internal parts of the valve and reduces the manufacturing cost of the whole valve.

Claims (4)

1. The temperature-sensitive wax-type thermal power element includes a housing (2), which is characterized in that: the lower end of the housing (2) is provided with a front housing (1), and the front housing (1) and the housing ( 2) are connected; a rubber sleeve (3) is provided in the housing (2), and a temperature-sensitive wax (7) is provided between the housing (2) and the rubber sleeve (3); the upper end of the housing (2) is provided with Plug (5), push rod (4) passes through plug (5) and is located in the rubber sleeve (3). 2. The temperature-sensing wax-type thermodynamic element according to claim 1, characterized in that a gasket (6) is provided between the rubber sleeve (3) and the plug (5). 3. The temperature-sensing wax-type thermodynamic element according to claim 1, characterized in that: the inner cavity of the rubber sleeve (3) provided with the push rod (4) is a vacuum. 4. The temperature-sensitive wax-type thermodynamic element according to claim 1, characterized in that: the end of the front housing (1) is an inverted cone serving as a valve core, and the front housing (1) and the housing (2) An internal thread is provided in the connected groove, and the internal thread in the groove of the front housing (1) cooperates with the external thread on the housing (2).

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